[ENH] - Support PIP install flags on conda-store

[empollon9]

Feature description

#2909

While creating an environment on conda-store, I needed to install a proprietary package with pip. I have seen the documentation on here, but it does not cover my scenario. I have my proprietary package in Azure Devops Artifacts which is normally installed with:

pip install mypackage==x.y.z --index-url https://mypackage:pat_asdf@pkgs.dev.azure.com/{organization}/{project}/_packaging/{mypackage}/pypi/simple/

where:

mypackage is the package name
pat_asdf is a PAT key
{organization} is your organization code in Azure
{project} is you projectname in Azure DevOps

This works fine on Conda, however when I try this on conda-store on nebari I get the following error:

File "/opt/conda/envs/conda-store-server/lib/python3.10/site-packages/packaging/requirements.py", line 37, in init
raise InvalidRequirement(str(e)) from e
packaging.requirements.InvalidRequirement: Expected package name at the start of dependency specifier
--extra-index-url https://mypackage:pat_asdf@pkgs.dev.azure.com/{organization}/{project}/_packaging/{mypackage}/pypi/simple/
^

Value and/or benefit

To be able to add pip install flags, this will allow to install PIP packages from other repositories in addition tto PYPI, like private repositories on Azure Dev-Ops. At the moment the only ones that can be use are Git or GitLab. PIP install flags wuld allow to use either --extra-index-url or --find-links for packages on a local directory that you an have downloaded previously.

I am happy to help if I get some support to look into the right direction.